Govind Swarup, an Indian radio astronomer, is credited with the discovery of the first quasar, 3C 48, in 1960.

Govind Swarup used the Ooty Radio Telescope, located in Ooty, India, to discover the first quasar, 3C 48.

Quasars are the most distant objects in the universe, and their study has provided valuable insights into the early universe and the formation of galaxies.

Jayant Narlikar, an Indian astrophysicist, is known for his work on the unified model of quasars, which proposes that quasars and active galactic nuclei are different manifestations of the same phenomenon.

The unified model of quasars proposes that quasars are the active nuclei of galaxies, and that the different types of quasars are due to different orientations of the accretion disk and the jet relative to the observer.

Ramnath Cowsik, an Indian astrophysicist, is known for his work on the X-ray emission from quasars, and for his contributions to the study of cosmic rays and gamma-ray bursts.

The X-ray emission from quasars provides valuable information about the accretion disk around the black hole, including its temperature, density, and size.

Arvind Paranjpye, an Indian astrophysicist, is known for his work on the optical emission from quasars, and for his contributions to the study of active galactic nuclei and gravitational lensing.

The optical emission from quasars provides valuable information about the black hole mass, including its mass and spin.

Janardan P. Vig, an Indian radio astronomer, is known for his work on the radio emission from quasars, and for his contributions to the study of interstellar scintillation and the solar wind.

The radio emission from quasars provides valuable information about the jet produced by the black hole, including its length, structure, and composition.

T. P. Prabhu, an Indian astrophysicist, is known for his work on the infrared emission from quasars, and for his contributions to the study of star formation and the evolution of galaxies.

The infrared emission from quasars provides valuable information about the host galaxy of the quasar, including its mass, star formation rate, and dust content.

Ajit Kembhavi, an Indian astrophysicist, is known for his work on the ultraviolet emission from quasars, and for his contributions to the study of active galactic nuclei and gravitational lensing.

The ultraviolet emission from quasars provides valuable information about the accretion disk size, including its radius and thickness.